build: add core_64_bit.mk

Add a new product, core_64_bit.mk, that products can inherit from
to configure zygote and the rest of the build system for a standard
64-bit product.

Make the 64-bit emulator targets for arm64, mips64, and x86_64
inherit from it.

Change-Id: I7e809264db39472f554cd5290529f3d6499345d4

target/product/aosp_arm64.mk

@@ -19,6 +19,7 @@
 # build quite specifically for the emulator, and might not be
 # entirely appropriate to inherit from for on-device configurations.
 
+$(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_base_telephony.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/board/generic_arm64/device.mk)
 

target/product/core_64_bit.mk

@@ -0,0 +1,40 @@
+#
+# Copyright (C) 2014 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Inherit from this product for devices that support 64-bit apps using:
+# $(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit.mk)
+# The inheritance for this must come before the inheritance chain that leads
+# to core_minimal.mk
+
+# For now this will allow 64-bit apps, but still compile all apps with JNI
+# for 32-bit only.
+
+# Copy the 32-bit primary, 64-bit secondary zygote startup script
+PRODUCT_COPY_FILES += system/core/rootdir/init.zygote32_64.rc:root/init.zygote32_64.rc
+
+# Set the zygote property to select the 32-bit primary, 64-bit secondary script
+# This line must be parsed before the one in core_minimal.mk
+PRODUCT_DEFAULT_PROPERTY_OVERRIDES += ro.zygote=zygote32_64
+
+# Temporary hack to prefer launching processes as 32 bit
+# instead of 64 bit.
+#
+# STOPSHIP: Revert this to allow products to select it themselves
+TARGET_PREFER_32_BIT_APPS := true
+
+# Temporarily leave these unset to keep all apps with JNI building as 32-bit
+# TARGET_SUPPORTS_32_BIT_APPS := true
+# TARGET_SUPPORTS_64_BIT_APPS := true

target/product/full_mips64.mk

@@ -19,6 +19,7 @@
 # mips64 build quite specifically for the emulator, and might not be
 # entirely appropriate to inherit from for on-device configurations.
 
+$(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_base_telephony.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/board/generic_mips64/device.mk)
 

target/product/full_x86_64.mk

@@ -23,9 +23,7 @@
 # that isn't a wifi connection. This will instruct init.rc to enable the
 # network connection so that you can use it with ADB
 
-# Override and force 64-bit Zygote. Must come first.
-PRODUCT_DEFAULT_PROPERTY_OVERRIDES += ro.zygote=zygote64
-
+$(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_base_telephony.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/board/generic_x86_64/device.mk)